CH 7: Homeostasis: Negative Feedback Mechanisms

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What is the main purpose of negative feedback mechanisms in homeostasis?

To maintain internal stability despite external changes (correct)

To deactivate bodily functions

To detect internal and external stimuli

To increase the production of hormones

How do high glucose levels affect blood sugar regulation?

They decrease insulin release

They trigger glucagon release

They lower blood sugar levels

They facilitate glucose absorption by cells (correct)

What is the role of thyroxin in the body's functions?

Increasing TSH release

Regulating metabolism and energy generation (correct)

Facilitating glucose absorption

Converting liver glycogen into glucose

Which gland secretes thyroxin in the body?

Thyroid gland Signup and view all the answers

How does negative feedback maintain metabolic balance concerning thyroxin levels?

An increase in TSH decreases thyroxin production Signup and view all the answers

What is the role of Aldosterone in salt balance?

Regulates sodium and potassium levels Signup and view all the answers

Which gland is responsible for adjusting ADH secretion in response to blood osmolarity changes?

Pituitary gland Signup and view all the answers

What is the main function of Antidiuretic Hormone (ADH) in the body?

Adjusts kidney water reabsorption Signup and view all the answers

Which mechanism is involved in cooling the body in response to heat?

Vasoconstriction and shivering Signup and view all the answers

What can lead to Goitre according to the text?

Thyroxin imbalance due to iodine deficiency Signup and view all the answers

What is the main function of insulin in regulating blood glucose levels?

Facilitating glucose absorption by cells Signup and view all the answers

How does negative feedback maintain blood glucose levels when they are high?

Prompts insulin release Signup and view all the answers

Which hormone is responsible for converting liver glycogen into glucose when blood sugar is low?

Glucagon Signup and view all the answers

What role do the hypothalamus and pituitary gland play in regulating thyroxin levels?

Monitor and control through TSH Signup and view all the answers

In body temperature regulation, what occurs when the body detects an imbalance?

Initiates a response to correct the imbalance Signup and view all the answers

How does negative feedback maintain homeostasis in response to high blood glucose levels?

Prompts insulin release Signup and view all the answers

What is the primary function of glucagon in regulating blood glucose levels?

Stimulating liver glycogen conversion into glucose Signup and view all the answers

What is the primary function of Aldosterone in salt balance?

Triggers potassium excretion and sodium retention in the kidneys Signup and view all the answers

How does the body respond to high blood sodium levels?

Increased kidney sodium reabsorption Signup and view all the answers

Why is maintaining a core body temperature crucial for enzymatic processes?

To prevent enzyme denaturation due to extreme temperatures Signup and view all the answers

What is the main role of chemoreceptors in blood pH regulation?

Monitoring carbon dioxide levels Signup and view all the answers

Which gland is primarily responsible for adjusting ADH secretion based on blood osmolarity changes?

Pituitary gland Signup and view all the answers

What triggers increased breathing rate and depth in response to low blood pH?

High carbon dioxide levels Signup and view all the answers

What can lead to disorders like diabetes mellitus according to the text?

Failure of glucose regulation Signup and view all the answers

In thermoregulation, what mechanism is responsible for conserving heat in cold conditions?

'Vasoconstriction and shivering' Signup and view all the answers

What is the primary function of the hypothalamus and pituitary gland in regulating thyroxin levels?

Monitoring and controlling thyroxin levels through TSH release Signup and view all the answers

Which hormone is responsible for lowering blood sugar by facilitating glucose absorption by cells?

Insulin Signup and view all the answers

What is the main function of glucagon in regulating blood glucose levels?

Converting liver glycogen into glucose Signup and view all the answers

How does negative feedback maintain homeostasis regarding blood glucose levels?

By releasing insulin when glucose levels are low and glucagon when levels are high Signup and view all the answers

What triggers the release of insulin in response to high blood sugar levels?

High glucose levels Signup and view all the answers

Which mechanism is involved in maintaining metabolic balance concerning thyroxin levels?

Regulation of TSH release Signup and view all the answers

How do low glucose levels affect blood sugar regulation?

Activating the conversion of liver glycogen into glucose Signup and view all the answers

Which hormone is primarily responsible for regulating kidney water reabsorption to maintain blood water levels?

ADH Signup and view all the answers

What is the main consequence of low blood sodium triggering aldosterone release in the body?

Increased potassium excretion Signup and view all the answers

In thermoregulation, which of the following mechanisms plays a role in cooling the body down?

Vasodilation and sweating Signup and view all the answers

What is the main function of the hypothalamus in maintaining homeostasis?

Detecting changes in blood osmolarity Signup and view all the answers

How do chemoreceptors contribute to blood pH regulation?

By signaling for increased breathing rate and depth Signup and view all the answers

What is the primary consequence of aldosterone release due to low blood sodium?